Cylinder-boring device



L. A. KREJCI. CYLINDER BORING DEVICE. APPLICATION man 1AN.25.`|921.

Patented Dec. 12, 1922.

Patented Dec. l2, 1922.

narran stares.

LADDIE ALOIS KREJCI, 0F CHICAGO,` ILLINOIS.

CYLINDER-BORING DEVICE. i

Application led January 25, 1921. Serial o. 439,796.

To aZZ 'whom t may concern Be it known that I, LAnDin Anors KREJCI, :a citizen of the United States, and a resident of Chicago, in the county of Cook and State `of Illinois, have invented a new and useful Improvement in Cylinder-Boring Devices, of which the following is a full, clear, and exact description.

My invention relates to improvements in boring devices, and `it consists in the combinations, constructions and arrangements herein described and claimed:

An object of my invention is to provide a device for boring or reaming cylinders that has means for centering ay boring barv or v,spindle thereof with respect to the inner wall of the cylinder and for maintaining the bar or spindle in adjusted position while permitting free functional movement thereof.-

A further object of my invention is to provide a device of the type described that has means for controlling the longitudinal movement of the boring bar or spindle relative to the cylinder to be re-bored during the operation thereof, whereby uniformity and accuracy of the out made is assured.

A further object-y of my invention is to provide a device of the type described that is relatively simple in construction and operation, thoroughly effective for the purpose intended and not likely to get out of order easily.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be pointed j out in the appended claims.

Fi 2, i

Fig. 4 is a view of a fragmentary portion of the device,

Fig. 5 is a view similar to Fig. 1, showing the device in operative position,

Fig. 6 is a section along the line (3#6 of Fig. 5,

Fig. 7 is a section along the line 7-7 of Fig. 1.

vReferring. now to the drawings, 1 denotes a cylinder that is conventional in construction and has viianges 2 and 3v at the ends thereof. In carrying out my invention, I

project intoy the bore 4 of the cylinder a' boring bar or spindle 5. A head 6 having an opening 7 therethrough registering with the lbore 4 of the cylinder rests on the iiange 2 and is secured thereto in any suitable manner as by means of bolts 8.

The boring bar or spindle 5 is loosely supe` portedat one end by a bracket bearing consisting of a sleeve 9V mounted on the same and Vhaving diverging arms 10 bent at l-11 parallel with ythe flange 3 for engaging therewith and being loosely secured thereto by .bolts 12. The i latter are projected through openings in the flange 3 and substantiallyalined openings 13 in the end portions of the arms 11, nuts 14 being screwed4 on the endsl of the bolts 12. The openings 13k have a diameter greater than that of the bolts 12 and vconsequently a limited movement of the arms 10 relative to the cylinder walls is permitted until the 4nuts 14 have been adjusted to clamp the ends of the arms 10 tightly against the flange 3. The collar 9 is preferably split longitudinally and provided with cooperating lugs 15 and 16,

spindle l5 is loosely supported adjacent its opposite end by means of a sleeve 18 that is mounted on the spindle andis formed with diametrically yopposed lateral exten-` sions 19 that are arranged to enter diametrically opposed slots 2O in upstanding lugs 21. The latter are integral with the head'. j v

Prior to placingthe sleeve 18 on the spindle 5, the mechanism used in -centering the spindle 5 within the bore of the cylinder is inserted within the bore of the cylinder. Such a mechanism'oomprises an inner sleeve 22 that-,is slidably mounted on the spindle 5 and is moved therealong into the position shown. The inner sleevey 22 is 'enlarged at its inner end at 23 and is `threaded exteriorly at 24 adjacent its opposite end.. Theouter wall of the enlarged portion 23 is beveled at 24. Mounted on the inner sleeve is a i second or outer sleeve 25 that is enlarged at both ends thereof at 26 and 27 so that the outer Walls of the enlarged portions are con-r centric With the inner Walls of the cylinder s 29. A spacing `Washer 33 has its outer Wall beveled at 34 complementary to the beveled Wall 29 and is mounted o-n the inner sleeve 22. Obviously, when jam nut 35 is screwed on the threaded portion 24 ofthe inner sleeve 22, the spacing Washer Will be forced along the latter into engagement' With the beveled Wall 2,9of the outersleeve and continued operation ofthe nut 35 Will cause the pins .3l to bermoved outwardly against the inner Wall of theA cylinder l, thereby centering the boring bar or spindle 5. The jam nut has its outer Wall lrnurled in order that the same may be conveniently operated. v

1Jlhenthe spindle 5 has been centered in the. mannerdescribed, the collar y18, which was placed on the spindle' after the; centering mechanism hasbeen arranged Within the bore of the cylinder as hereinbefore pointed out, is secured incadjusted position relative to the head 6 by means of pins 36 that` are projected transversely through the lugs 2O and 2l., as shown.' `'lhe collar 1851's preferably split and providedwith cooperating lugs 37 and 38 which are secured together by means of a bolt 39 or the lilreso that thev collar may be adjusted to the spindle 5 to preventplay of the same therein While-permittinoir longitudinal movement of the; same.

tu 2J i v therethrough. The spindle 5 is then further secured in itscentered position by tightening the bolt 17 that secures'the lugs l5 and 16 of the collar i9 together andby tightening the' nuts let toclamp the nut 'portions of' the bracket arms l0 rigidlyA to the flange-3 ofthe-cylinder.

From the foregoing description of the variouszparts-of the device, the operation thereof may be readily understood. lWhen the spindle 5 has been centered with respect to the .bore of the cylinder and'secured in adjusted position in the manner hereinbefore described, the collar 18 is removed from the spindle the centering lmechanism thenk Y. Withdrawn from the bore of .thecylinder and from 'the spindle. A holderor head i-O that is provided with cutters el is 'then placed on the spindle and secured thereto in any suitable mannen The collar 18 is again mounted on the spindle l5 and secured to the head 6 in the manner hereinbefore described.v 'feedscre'w l2 embodying a rod having a threaded end thereof engaging a threaded socket i3 in the end of the spindle 5 is co-axiallyalined with the latter and `is thr'e'aded'at `il"'forthe greater part of its length. This feed screw Works in a threaded nut or collar l5 having flanges 46Y at .the ends thereof and held between the forlrsl 47Y of a bracket arm 48 thatis 'carried' byrod'v lli).y The latter is vparallel"with l the .feedscrew l2 and has its upper endfthereof threadedy at 50 forengageinent Witlia threaded socket 5l in onev of. the armsflllof the bracket bearing.A lt vvillbenoted that the nut or sleevee is formed oftvvo identical half .portionsithat are maintained the position shovvncby mean'sof/a bolt', or pinA 52 yprojected transversely through, theY forks 47 of the bracket arni48.

lt will also be understood thatthe cylinder l will be rigidly supported in anysuitable manner ybefore the boringV oper-ation iscoin-i, nienced, no `means for. supporting/the same`- being shown in the'dravvingsf-Thelspindle may be turned by handfand the end there-A of is therefore squared at`v53for engagement with a crank handlefnotv sliovvii)'`V the spindle 5 is rotatedtheengageme-nt Vof the feedfscreyv 4:2 With the threaded'"sleeve or nut l5 Will occasion v`a longitudinal movement of the boring-head4 l0Vv relalt'ive'tov the' cylinder l andthe eXtentof thisfmovernent during each revolution ofthefspindle is vcle-y terniined by the pitch of the screyv. Consequently the4 cut eifect'ed by .thewrotary movement of the spindle5 Will'.benniforrnV and regular throughout the entire lengthof the cylinder.

l. A device'of the type described yconifprising a spindle adaptedlto bey disposed in a. 'cylindem and means :for centering said spindle with respec'tto the vvallof the cylinder, said means comprising a :sleeve slidably disposed on said spindle; said sleevehaving one of its ends threaded, and'itsother end being fashioned with a tapered projection, ,a second sleeve slidably mounted onf'said first nan'ied sleeve and .havingthe ends offitsbore tapering outwardly, said sleeve having'a-plurality of transverse openings adjacent each end'thereof, a tapering Washer slidablyfdisposed on said first named sleeve and being disposecL adjacent to the threaded portion thereof, a nut disposed on the threaded 'portion of said first-.named sleeve,andfpins ydisposed in the openings of said secondin'arned sleeve and being adapted'to abutrthefwall of the cylinder. i

ln a device of ithe type described', a sleeve, said sleeve having one of its rends' threaded, and its other end being fashioned with a tapered projection, a second sleeve slidably mounted on said first named sleeve and having the ends of its bore tapering outwardly, said sleeve having a plurality of transverse openings adjacent each end thereof, a tapering washer slidably disposed on said rst named sleeve and being disposed adjacent to the threaded portion thereof, a nut disposed on the threaded portion of said iirst named sleeve, and pins disposed in the openings of said second named sleeve.

8. In a device of the type described, a spindle, a sleeve slidably disposed on said spindle, said sleeve having one of its ends threaded, and its other end being fashioned with a tapered projection, a second sleeve slidably mounted on said rst named sleeve and having the ends of its bore tapering outwardly, said sleeve having a plurality of transverse openings adjacent each end thereof, a tapering washer slidably disposed on said first named sleeve and being disposed adjacent to the threaded portion thereof, a nut disposed on the threaded portion of said first named sleeve, and pins disposed in the openings oi said second named sleeve.

4. In a device of the type described, a head adapted to be securedto a cylinder, two pairs of lugs carried by said head, each pair of lugs having alined openings therein, a sleeve having extensions adapted to be disposed between said pairs of lugs, said eX- tensions having openings therein which are adapted to be alined with the openings of said lugs, and pins adapted to be disposed in the openings of said lugs and said eXtensions.

LADDIE ALOIS KREJCI. 

